<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .inp{
        /* 去除默认样式 */
        appearance: none;
        width: 100px;
        height: 100px;
        background-image: url('./img/check.jpg');
        background-size: 100% 100%;
    }
    .inp[type='checkbox']:checked{
        background-image: url('./img/checked.jpg');
    }

</style>
<body>
    <input type="checkbox" name="" id="" class="inp">
</body>
</html>